Boiler-flue cleaner.



PATBNTED JAN. 21, 1908.

s. e. BLADH. BOILER FLUE CLEANER. APPLICATION FILED JUNE 5.1906.

Inventor- By his Aft rue uuRRrs PETERS CO.,:WASHINDTDN, n. c, v

SVEN GUSTAF BLADH, OF .GARLSKRONA, SWEDEN.

BOILER-FLUE CLEANER.

Specification of Letters Patent.

Patented Jan. 21, 1908.

Application filed June 5. 1906- Serial No. 320282.

T all whom it may concern:

Be it known that I, the undersigned, SVEN GUSTAF BLADH, naval engineer,Borgmastarebron, Carlskrona, Sweden, have invented 5 certain new anduseful Improvements in Boiler-Flue Cleaners; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it ap- 0 pertainsto make and use the same, reference eing had to the accompanyingdrawings, and to letters or figures of reference marked thereon, whichform a part of this specification.

This invention relates to and has for an object to provide an improvedboiler flue scraper.

The object sought to be obtained by the invention is to provide meansfor removing from boiler tubes or fiues such soot as is collected on orbetween the same; and to remove it in a more expeditious and thoroughmanner than has been possible with the implements now in use. By thethorough removal of the soot the efiiciency of the boiler will beenhanced.

' This invention is particularly a licable to .boilers of the Yarrow andBelliv e pattern. The improved scraper will be made out of 3c elasticmaterial, which may be steel wires or threads held in proper positionfor engaging the sides and to and bottom of the tubes.

The improve scraper is illustrated in the accompanying drawings, whereinas Figure 1 is an edge view of the scraper showing this'in positionbetween a series of tubes. Fig. 2 is a face view of a ortion of thescraper illustrated in Fig. 1. ig. 3 is an end view of Fig. 2. Figs. 1,2 and 3 are pro- 40 jections one from the other. Fig. 4 is a roken awayface view of the plates or strips constituting the body portion of thescraper. Fig. 5 is an edge view of the parts shown in Fig. 4; and Fig. 6is a cross section of the parts shown in Fig. 4. Figs. 4, 5 and 6 areiplrojections one of the other and in these gures the elastic threadsare not illustrated. These latter views Figs. 4, 5 and 6, are on alarger scale than are the former views .50 Figs. 1, 2 and 3. Y

Between the two longitudinal strips 1 and 2, preferably made of sheetmetal and which constitute the body portion of the scraper, are securedelastic threads 3, which may be of some suitable material, as forinstance,

steel wires arranged parallel to each other and normally all lying inthe same plane 5 and disposed in a direction transverse to, and inthepresent instance substantially at right angles to the longitudinaldirection of the strips 1 and 2. These threads 3 may be made of veryfine wire, the diameter being preferably about 0.5 mm., and of a lengthadapted to the size of the scraper and the dis tance between the tubesor flues with which it is to be employed. The threads 3 can be fastenedto one of the strips or between these in some suitable manner, forinstance by soldering or by bowing the strips, etc.; sometimes it willeven be sufficient to use merely one 7 strip, the one to which thethreads are 'affixed in a suitable way.' In case two strips are usedthen such strips are secured together so that the adjacent edges of thestrips will not lie in the same plane. The strips are shiftedtransversely about 2 mm. one from the other. That is to say the saidstrips are preferably of equal width and are placed in such'relationthat their edges are substantially arallel and one edge of each stripex- 30 tends beyond the adjacent edge of the other strip. The strips maybe held together by riveting and the rivets may be laced at certainfixed distances one from t e' other. A

row of rivets is illustrated along each edge 5 i and arranged so thatlongitudinally of the strip a rivet of one row will be disposed midwaybetween two rivets of the other row.

At suitable portions, preferably between the rivets adjacent to suchedge the overhanging or projecting edge of each strip is bent againstthe threads and a little over the edge of the other strip. This bendingmay preferably take place so that the deflection of the threads upon therespective sides does not occur in the same transverse plane. By these.means the threads are bent out to the side atthese places so that theywill conform to the shape and arrangement of the tubes of the boiler,see Fig. 1. Of course this bending of the threads may be effected insome other manner without departing from the spirit of my invention. Itwill be seen that the threads are so bent out to the sides attheir outerparts so as to reach over half of the diameter of the'flue at both sideswhen the scraper is inserted between the fines. By this means thescraping and cleaning action will be very efiicient.

Having now particularly described and ascertained the nature of thissaid invention and in what manner the same is to be performed I declarethat what I claim is:

1. In a boiler tube scraper, the combina tion of a pair of strips ofsheet metal of substantially equal width, the edges being disposed inparallel relation, and one edge of each strip extending beyond theadjacent edge of the other strip, and elastic threads and elasticthreads between said strips and extending beyond the edges of the same,a row of rivets along each edge and passing through said strips, forholding these together upon said threads, said rivets being arrangedso-thatlongitudin'ally of the strip a rivet of one row will be disposedmidway between two rivets of the other row, each of the said "extendingstrip edges being bent over the adj ace'nt edge of the other strip atpositions between the rivets along such edge and thereby bending thesaid elastic threads out of their normal plane.

, In testimony that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

SVEN GUS'IAF BLADH. Witnesses (3. M. LAV'TDINI, O. F. SvENssAN.

